"James Pickering" <jp29@cox.net>
>Their Technical Department was not encouraging about
>effecting Content-Negotiation but I found that inserting the following
>PHP code ..........
>if ( isset($_SERVER["HTTP_ACCEPT"]) and
>stristr($_SERVER["HTTP_ACCEPT"],"application/xhtml+xml") ) {My
>header("Content-type: application/xhtml+xml");
>}
>else {
>header("Content-type: text/html");
>}
Unfortunately this is incorrect, and would violate HTTP 1.1, the Accept
header is considerably richer in what it can say than the above uses.
Particularly q values of 0, so you should also take care to not send xhtml
to an UA with accept headers containing:
text/html,x.application/xhtml+xml
text/html,application/xhtml+xml+chickens
text/html,application/xhtml+xml;q=0
text/html,application/xhtml+xml; q=0
text/html,application/prs.jibberjim; level="application/xhtml+xml"
or probably some other things, this is by no means an exhaustive list. See
http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.1 for more
information.
Cheers,
Jim.